Carriage-stop for type-writing machines.



PATBNTED JULY 25, 1905.

R W m www mw ,Sx E 5 m m m fc wm.

m Wim \O M \mHI|WWU MM VE M m v w mv m. m rf HMNY,M

detached from the carriage.

`4 4 of Fig. 1.

UNITED STATES i PATENT OFFICE.

GEORGE IV. SINGLETON, OF DES MOINES, IOWA, ASSIGNOR TO JEWETT TYPEVVRITER COMPANY, OF DES MOINES, IOWA, A CORPORATION OF IOWA.

CARRIAGE-STOP FOR TYPE-WRITING MACHINES.

Specication of Letters Patent.

Patented July 25, 1905.

"10 @Z whom, it may concern;

Be it known that I, GEORGE W. SINGLE'roN, a citizen of the United States of America, and a resident of Des Moines, Polk county, Iowa, have invented a new and useful Carriage-Stop for Type-Writing Machines, of which the following is a specification.

The object of this invention is to provide improved means for carrying marginal and lock stops on the front bar of the carriage of a type-writing machine and at the same time utilize said front bar for the placing of removable stops, as for tabulating, and for the exhibition of a scale whereby the location of Said carriage relative to the center of the type-basket of the machine may be determined.

My invention consists in the construction, arrangement, and combination of elements hereinafter set forth, pointed out in my claim, and illustrated by the accompanying drawings, in which- Figure 1 is aface elevation of the front bar Fig. 2 is a rear elevation of the bar shown in Fig. 1. Fig. 3 is an end elevation of the bar, the stops being removed therefrom. Fig. 4 is a cross-section of the bar and one stop on the indicated line Fig. 5 is an inner face elevation of one of the stops detached from the bar. Fig. 6 is a plan of one of the pointer-plates detached from the stop.

In the construction of the device as shown, the numeral 10 designates a bar formed with screw-holes 11 in its corner portions, whereby screws may be employed to attach the bar to the carriage of a type-writing machine. A slot 12 is formed in one end portion of the bar 10 and may be employed to receive a lever (not shown) common in some styles of machines and used to rotate the platen and move the carriage to the right.

A scale 13 is formed on the front face of the bar 10, and the graduation-marks thereof kpreferably are formed by indentations filled with white substance, while the face of the scale is nished with a black coating, such as japan or lacquer. The scale 13 is of alength Icorresponding with the possible travel of the carriage and is subdivided into equal spaces corresponding with the number of letters that may be imprinted successively in a line in the travel of the carriage once across the typebasket.

A groove 14 is formed in and longitudinally of the rear face of the bar 10 parallel with the upper and lower edges of said bar and preferably nearer to the lower edge thereof. A rack is formed on the rear face of the bar 10, preferably by sewing transversely of the bar, and thereby producing teeth 15 of equal face and equally spaced apart. In cutting the teeth of the rack I prefer to use a saw three inches in diameter arranged in such a manner that the lowermost portion of the kerfs may intersect the groove 14. Thus the portions of the kerfs between the lower ends of the teeth (immediately above the groove 14) vare of the greatest depth, lthe kerfs tapering out at the upper ends of the teeth. No account is taken of that portion of the rack below the groove 14 further than that it serves as a guide, the teeth thereon performing no useful function and being formed merely incidentally to the formation of the teeth 15. The upper and lower edges of the rack are dovetailed oppositely.

A marginal stop 16 is formed of a single block of metal of a width corresponding closely to the width of the bar 10. The inner face of lthe marginal stop 16 is planed longitudinally to a given depth, and the groove 17 thus formed is cut under or dovetailed at its sides to produce opposing lips 18 19, arranged to engage slidably the dovetailed upper and lower edges of the rack. (See Fig. 4.) The face of the marginal stop within the groove 17 is planed longitudinally to a given depth to form a deeper groove 2O of less width than the main groove. The marginal stop 16 is planed transversely in the central portion of its inner face to a depth greater than the depth of the main groove 17, and a latch-bar 21 is mounted for rectilinear movement in the transverse groove thus formed, the forward face of the latch-bar being flush with the face of the main groove. The upper end of the latch-bar 21 is reduced in cross-section, and a head 22, formed with a central aperture, is mounted thereon, the reduced end portion of the bar entering and being expanded in said aperture to secure the head thereto. A hole 23 is formed in the central portion of the marginal stop 16, and a screw 24 is screwed into the latch-bar 21 from the rear and has its head extended into said hole. The head of the screw 24 is of approximately one-half the diameter of the hole 23 and may move vertically across said hole in the vertical reciprocation of the latch-bar, serving as a stop to determine the upward movement of said bar. A torsional spring 25, preferably made of wire, is mounted in the groove 20 of the marginal stop 16. One of the arms of the spring 25 impinges the lower wall of the groove 20, and the other arm of said spring terminates in a hook engaging below and impinging the screw 24 between the-head of said screw and the rear face of the latch-bar 21. It is the function'of the torsional spring 25 to raise and yieldingly support the latch-bar 21. Detents 26 27 are formed on and project forward from the latch-bar 21. The detents 26 27 are alike in size and shape and are of a height slightly less than the width of the groove 14 in the bar 10, of a width to fit the kel-fs between the teeth 15 of the rack, and are spaced apart on the latch-bar a distance just suflicient to admit one of said teeth. detents 26 27 normally embrace one of the teeth 15 of the rack in a plane just above the groove 14 and are held in such position by the resilience of the torsional spring 25. In engaging position the detents 26 27 lock the marginal stop to the bar 10; but upon the application of manual pressure to the head 22 the latch-bar 21 is depressed and carries the detents out of engagement with the teeth and into the groove 14. Thereupon and without relaxing the manual pressure the marginal stop may be moved longitudinally of the bar 1() and permitted to stop as desired. A lug 28 is formed on and extends downwardly from the lower edge of the marginal stop 16, and it is the function of said lug to engage a fixed abutment (not shown) of the frame of a writing-machine and stop the movement of the carriage to the right.

Screw-seats are formed in the upper edge of the marginal stop 16, and a pointer-plate 29, formed with slots 30 31 in its horizontal portion, is mounted on said stop with'said slots in registration with said seats. Screws 32 33 are mounted through the slots 30 31 and seated in the seats. 'l` he pointer-plate 29 is notched in its central portion to embrace the latchbar 21 loosely, and a lug 34 is formed on and turned upward from said plate adjacent the notch and beneath the head 22 of said latchbar. It is the function of the lug 34 to stop and determine the downward movement of the latch-bar 21 by engagement with the lower face of the head 22 when manual pressure is applied to the head, to the end that the detents 26 27 may not engage the teeth below the groove 14 in the rack. The pointer plate 29 is bent on a line longitudinally thereof and extends downward in front of the bar 10. An index 35 is formed on and depends from the center of the downturned portion of the pointerplate 29 and, when the marginal stop is locked to the bar, indicates one or another of the scalerlhe index 35 is pointed marks or indices.

The

or attenuated at its lower extremity, and said point is in direct opposition to thecenter of the space between the detents 26 27. Hence when the detents are in position engaging two of the teeth 15the point of the index'is directly over one of the scale-marks of the bar 10. r1 he face of t-he lug 34 is spaced from the point of the index 35 such a distance that when the lug stops by contact with the abutment the index 'will be directed to the desired scale-mark, thus representing that the carriage is in such position or point within the limits of its travel as will insure the application of the next-used type at a predetermined distance from the left margin of the sheet being imprinted.

- A pin 36 is mounted in and projects rearward from the bar 10 between the marginal stop and the left end of said bar, and it is the function of said pin to limit movement of the stop in one direction on the bar.

A lock-stop 37 is provided and constructed identically with the marginal stop 16, except in one particular hereinafter made clear. The lock-stop 37 is mounted on the bar 10 in like manner to the marginal stop and is latched to said bar by a latch-bar 38, identical in form and operation with the latch-bar 21. The difference in construction is this: The lockstop 37 is provided with a lug 39, formed on and projecting downward from its center portion, which lug is arranged for engagement with a key-locking device of conventional form, (not shown). whereby the keys of the writing-machine are locked and the movement of the carriage to the left is stopped pending manual release by means foreign to the present invention. A pin 4() is mounted in and extends rearward from the lug 39, and it is the function of said pin to engage a bellringer of conventional form, whereby a signal may be given that the carriage is nearing the limit of its movement to the left. The face of the lug 39 is spaced from the transverse plane of the point of the index on the lockstop a less distance than the face of the lug 28 is spaced from the index 35in order to lock the keys at a predetermined point in respect of the desired end of the line being irnprinted.

A pin 41 is mounted in and projects rearward from the bar 10 between the lock-stop and the right end of said bar, and it is the function of said pin to limit movement of the stop in one direction on the bar.

I do not limit myself to the details of construction and combination of elements described and shown herein, for the reason that various modifications of structure may be employed to effect the same end and the same stop devices may be used on other forms of bars without departing from my invention.

I claim as my invention- In a type-writing machine, the bar formed with a scale on one face and a'rack on the face opposite the scale and a groove longitudinally of and intersecting the rack, a stop grooved in one face and arranged to embrace the rack, a latch-bar arranged for rectilinear reciprocation on the stop, detents on the latch-bar arranged to engage the rack and be moved with the detent for travel in the groove, an expansive spring interposed between the latch-bar and stop whereby the detents normally are held in engagement with the rack, a pin on the latch-bar and arranged to engage the stop and limit the movement of the latchbar in one direction, a pointer-plate on the stop and provided with a pointer indicating the scale, and a stud on the pointer-plate arranged for engagement by the latch-bar to limit movement of the latch-bar in a down- Ward direction.

Signed by me at Des Moines, Iowa, this 26th day of May, 1902.

GEORGE W. SINGLETON. Witnesses:

GEo. A. JEWETT, S. C. SWEET. 

